Bolt threading machine



(No Model.) 3 Sheets-Sheet 1. A. WOOD. BOLT THRBADING MACHINE.

No. 405,236. PatentedJune 11, 1889.

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3 Sheets-Sheet 2.

(No Model.)

A. WOOD. BOLT THREADING MACHINE.

' No. 405,236. Patented June '11, 18 89.

(No Model.) 3 Sheets-Sheet 3.. A. WOOD.

BOLT THREADING MAGHINE. v No. 405,236; Patented June 11 1889 l wchaooeo 81 0mm $51 Moan-e1 N. PETERS Plmluukhogrnphcn Wnshinglnu. u c

UNITED STATES ATENT FFICE.

AURIN WOOD, OF l/VORCESTER, MASSACHUSETTS, ASSIGNOR TO CORNELIUS GRAY, OF SAME PLACE.

BOLT-TH READING MACHINE.

SPECIFICATION forming part of Letters Patent No. 405,236, dated June 11, 1889.

Application filed January 21, 1888. Serial No. 261,540. (No model.)

To all whom it may concern.-

Be it known that I, AURIN \VOOD, acitizen of the United States, residing; at \Vorcester, in the county of lVorcester and State of Mase sachusetts, have invented a new and useful Improvement in Bolt-Cutters, of which the following is a specification, reference being had to the accompanying drawings, illustrating a bolt-cutting machine embodying myin- IO vention, and in which Figure 1 represents a side view of the machine. Fig. 2 is a top view of the rotating tail-stock, partly in section, on line Y Y, Fig. 1. Fig. 3 is a plan View of the machine. Fig. 4

is a longitudinal sectional view of the revolving spindle, carrying the head in which the dies are held. Fig. 5 is a detached view of one of the cutting-dies. Fig. 6 is atransverse sectional view on line X X, Fig. 1, in the di rection of arrow 1. Fig.7 is a transverse sectional view on line X X, Fig. 1, in the direction of arrow 2; and Fig. 8 is a perspective view of the toothed sliding plate by which the head is operated, also showing the con- 2 5 n-ected latching mechanism for opening and closing the dies.

Similar letters refer to similar parts in the several views.

My invention relates to a machine for cutting the screw-threads on bolts; and it consists in the construction and arrangement of the several parts, as hereinafter set forth, and specifically named in the annexed claims.

A A denote the supporting-stand upon 3 5 which the operating parts of the machine are mounted. Journaled in bearings upon the stand A is a spindle B, driven through the gear-wheels l3 3 from the cone-pulley B Within the spindle B, which isahollow sleeve, is placed another hollow spindle B capable of sliding within the hollow spindle B, and having a spline-connection with the spindle B, so its rotary motion is imparted to the spindle B". A collar B is screwed upon the screw-threaded portion a of the spindle B, having an attached sleeve B, provided with flanges, which inclose a neck B to receive a forked carrier, by which a longitudinal sliding motion is given to the spindle B through ter described.

connected operating mechanism, as hereinaf sliding spindle B and the dies are moved 6o radially to open and close them by wedgeshaped pieces engaging the outer ends of the radially-sliding dies, as shown in Fig. 5. The wedge-shaped pieces are held in a block 0 having bars 0 carrying cam-rolls C which are held in the cam-slot B of the sleeve B A sliding motion is thus imparted to the sliding block 0 and wedge-shaped pieces 0 by means of the rotation of the sleeve 13 around the sliding spindle B The construction and operation of that part of my present machine relating to the method of opening and closing the dies, as above described, are substantially the same as that employed in the bolt-cutter forming the subject of Letters Patent No. 7 9,714, granted to me on the 7th .day of July, 1868, to which reference may be had for a more full and detailed description.

D is a' shaft placed transversely to the supporting-stand and at right angles to the spindle B, carrying a pinion D, bevel-gear D and hand-Wheel D. Poweris applied to the transverse shaft D at will, or by the automatic action of the machine through the belt-pulleys D D and a belt-connection, shaft D, journaled on the side of thestand A,bevel-gear DZhav- 7 ing its hub journaled in a bracket D 011 the side of the stand A, and a clutch-connection D, the sliding half of the clutch having asplineo connection with the shaft D, whereby the rotation of the shaft D is imparted to the bevel-gear D The sliding half of the clutch D" is operated by a lever D pivoted on the side of the stand A, with a bar D pivoted 5 to the lever at D and sliding on a stud D in the stand, the sliding bar D having a forked arm D engaging an annular groove D on the sliding half of the clutch D. A spring D serves to hold the bar D to the ICC left, disengaging the clutch D".

A sliding plate E (shown in perspective view in Fig. i) is placed in ways in the supporting-stand A, directly beneath the revolving spindlel having a forked spimlle-carrier E attached to its upper side, and with teeth E upon the under side forming a rack which is engaged by the pinion D on the transverse shaft D. The forked carrier enters the neck 13" on the sleeve 1}", the spindle 1 being thus caused to slide within the hollow spindle B by means of the rotation of the transverse shaft 1), either by the hand wheel D or through the clutch-connection D". The sliding plate also carries mechanism by which the dies U U are opened or closed, consisting of a spindle F, journaled in lugs F on the plate E. To the spindle F, I attach the lovers 1 and F, with the lever I placed opposite a series of ratchetshaped teeth B on the sleeve B and the lever I opposite a series of wing-shaped projections (1 on asleeve Clinclosing and attached to the block 0. The lever is bent at right angles at 1. and a spring is placed between its lower end and the side of the sliding block or plate E, by which the lever 1 is carried toward the ratchetteeth 13, unless held away by a spring-latch F,as shown in Fig. 8. Whenever the spring latch F" is withdrawn, releasing the lever E the tension of the spring F will carry the upper end of the lever F forward, so the bent end 1?" will engage one of the ratchet-shaped teeth ll as the-sleeve l3 revolves in the direction of the arrow 1, Fig. 7, thereby dogging the sleeve li while the continued rotation of the spindle 13, carrying the die-holding block. 0 and sleeve (3 will move the ca1nrolls C along the cam-slot 13", causing the sleeve C and wedge-shaped blocks C 110 be drawn to the left and moving the dies (1 O radially outward, in the same manner as is fully described in Patent No. 70,714, already referred to.

A bent latch G is pivot ed upon the upper surface of the stand A, which bentlateh is (-z'nrried past the lever l) as the lever is moved to the right by means of a spring G, so applied to the latch as to carry it against the stop-pin G bringing the latch against the lever D and rctainingit against thetension of the spring 1), holding the cl ntch l) in engagement, and causing the transverse shaft .1) to be driven by power from the pulley I) through the connectingmechanism already described, turning the shaft T) in, the direction of the arrow 3, Fig. 3, and moving the spindle l to the left, or into the hollow spindle 1;, until the bent rod ll, extending from the side of the slidingplatc E, brought in contact wit-h the latch G, compressing the spring G and withdrawing the latch from the lever D, and allowing the spring D to move the sliding bar D and throw the clutch I)" out of engagement, thereby disconnecting the shaft 1) from the driving-power and checking the movement of the sliding spindle ll.

ll ithin the sliding spindle ii is a core 1,

fitting concentrically in the spindle ii" and held from any longitudinal movement by a tube 1., connecting the concentric core I with a collar 1 in the end of the spindle B, and through the core, tube, and collar is an opening I, through which a rod may be passed upon which ascrew-tlnrcad is to be cut; or a center 1*, Fig. 41, may be inserted and held concentrically with the cutting-dies G (I, for the purpose hereinafter set forth.

The cam-slot 13" is a continuous slot around the sleeve 15, and is so shaped that a quar ter-revolution of the spindle 13, when the sleeve B is held from turning, will cause the dies (J (J to be opened or closed. The sleeve 3' is provided with four equidistant wings (1", so that whenever the lever F is made to engage one of the ratchet-shaped. teeth 1 on the sleeve 13 one of the wings G" will th row the lever F out of engagement within a quarter-revolution, the spring-latch F retaining the lever 11 and allowing the sleeve 11 to continue to rotate with the spindle l3 and the cutting-dies to remain at rest either opened or closed, according to the position of the cam-slot I)" relatively to the cam-rolls U. The lever F is automatically thrown into engagement with the ratchet-teeth. 1; at the end of the movement of the sliding spindle 3" to the right by means of a screw J, adjustably attached to the frame of the machine, which is placed in the path of the springlatch F", causing it to be disengaged from the lever E and allowing the spring E to carry the bent end E into the path. of the ratchet teeth B, checking the rotation of the camslotted sleeve B and opening the dies (1 (l. The lever D is then brought to the right, engaging the clutch I) and cai'ising the spindle 13 to be moved to the left by power until it has reached the limit of its reverse movement, when the bent rod ll is brought in contact with the bentlateh G, releasing the lever D and permitting the spring I) to disengage the clutch 1).

Upon the supporting-stand A, I place a sliding plate K, capable of being moved along ways K and attached to the stand, so the distance between the sliding plate K and. the sliding spindle 13 may be varied, and upon the sliding plate K is mounted a turret capable of rotating about a vertical axis lying in the same plane as the axisol. the spindle ll. The turret K forms a si'lpportingframe for two pairs of jaws K" K, actuated by two pairs of screws provided with a right and left hand screw-thread K h. and a gearwheel K the gear-wheels of each pair of screws being in mesh with an actuating-pinion K attached to a spindle journalcd in the top of the turret and provided with a shank K, to which a crank or wrench is applied in order to rotate the screws and open or close the jaws K K). Either pair of jaws may be brought opposite the end of the sliding spindle li at will by rotating the turret K which is held from turning in. the desiredposition.

ITO

by means of a spring-actuated bolt K sliding in a stud K, projecting from the upper side of the sliding plate K. The two jaws K K are placed upon the right and left hand screws, so they will hold a rod or bolt coincident with the axis of the revolving spindle l3. NVhenevcr it is required to cut a screwthread upon what are known as finished bolts, or those which have been turned to a true cylindrical form, it is necessary to hold them upon centers, in order that the screw thread may be form ed concentrically with the axial line of the bolt. This is accomplished in my improved bolt-cutter by placing a center I in the opening 1 to hold the end of the bolt to receive the screw-thread, while the opposite end of the bolt is held upon the center L, held in a sliding block L, sliding in ways L in the turret K3.

The block L has a screw-threaded bolt L? extending across the turret and having a hand-nut L held from longitudinal movement by means of a groove or neck L inclosed in the turret. The center L is thereby adjusted in a line coincident with the center 1 and with the axis of the spindle B Above and below the center L are the jaws M M, having a sliding motion in ways M and actuated by the right and left hand screws M M, which are geared together at the top and operated by applying a crank or wrench to the squared section M, and bringing the jaws M M upon the bolt-head, so as to hold the bolt from turning. Holes are placed in the base of the turret in proper position to receive the spring-bolt K and hold the turret in either of the positions, with one. of the pairs of jaws K K in position to present a bolt held therein to the action of the cuttingdies or with the center L in position to receive the bolt, as described. The cam-slot B is so formed that the throw of the slot or movement of the cam-rolls O to the right is sufficient to close the dies and the movement to the left to open the dies; but at that part of the camslot at which the cam-rolls are carried to the extreme left, thereby opening the dies, I form the pockets N, one of which is shownin Fig. 3, in order to allow the sleeve 0 attached block C and wedge-shaped pieces O carried therein, to be moved still farther to the left, thereby withdrawing the wed ge-shaped pieces entirely from the dies, and permit the dies to be withdrawn.

The operation of cutting a screw-thread upon a bolt is as follows: Thebolt is seized by one pair of the jaws K K. and the turret turned to present the bolt to the cutting-dies, which are advanced upon the bolt by means of the hand-wheel I), when the movement of the cutting-dies will be continued by reason of their cutting action upon the bolt until the springlatch F is brought in contact with the screw J on the stand A, thereby releasing the lever F which is carried forward by the act-ion of the spring F" to engage one of the ratchet-shaped teeth B, dogging the sleeve B and permitting the cam-rolls C to move along in the cam-slot l3 and draw the sleeveof the lever F is reversed by the action of one of the wing projections C on the sleeve 0 allowing the cam-slotted sleeve 13 to again revolve with the spindle B and checking the further withdrawal of the sleeve 0 The lever D is then moved to the right, engaging the clutch D and applying power to cause the reverse motion of the spindle 13 as already described, the lever D being held in position to hold the clutch D in engagement by the bent latch'G until the spindle has reached the limit of its reverse movement, when the bent rod H is brought in contact with the latch G, releasing the lever D and allowing the spring D to disengage the clutch D While the operation of cutting a screw-thread upon one bolt is being carried on, a second bolt is placed in the jaws K K upon the opposite side of the turret, and when the operation has been completed upon one bolt the turret is turned one-half arevolution and the second bolt presented to the action of the cutting-dies.

, W'henever what are known as finished bolts are to be cut, the turret is rotated to bring the center L in line and in opposition core I, as shown in Fig. 4, and the operation carried on of cutting the screw-thread, as already described with reference to unfinished or rough bolts.

' Thedies are constructed in two pieces, as shown in Fig. 5, in which 1) denotes a block having-a radially-sliding motion, and being provided with a lip c at its outer end engaging a similar lip (l in the wedgeshaped piece C To the inner end of the block b, I attach the screW-thread-cutting plates 6 by means of the screws f f, thereby enabling the plates 6 to be replaced when worn without incurring the expense of entire new blocks 1).

, hat I claim as of myinvention, and desire to secure by Letters Patent, is-

l. lhe-coinbination, with a hollow revolving spindle and a die-carrying spindle held concentrically in said hollow spindle, of a rack having a sliding motion, and so connected with said die-carrying spindle as to impart a to the spindle, and a center I placed in the IIO ion on said transverse shaft, said rackbeing so connected with said die-carrying spindle as to impart a sliding motion thereto, of a bevel-gear journaled by its hub and engaging the bevel-gear on said transverse shaft, a shaft passin loosely through the journaled hub of said bevel-gear, and a clutching device by which said shaft is connected or disconnected with the hub of said bevel-gear, substantially as described.

3. The combination, with a sliding plate connected with the die-holding mechanism and provided with a toothed rack, and a transverse shaft having a pinion engaging said toothed rack, of a driving-shaft connected with said transverse shaft through a clutchconnection, a lever pivoted 011 the frame of the machine, a sliding bar carrying a forked arm and connected with said pivoted lever, and a rctraetile springapplicd to said sliding bar to disengage said clutch-cormection, substantially as described.

L The combination, with a sliding rack connected with the die-holding mechanism, a transverse shaft carrying a pinion engaging said rack and connected with the drivingpower through a clutch-connection, and a clutch-operating mechanism consisting of the lever D", bar 1), forked arm I), and retractile spring I)*, of the bent latch G, arranged to engage said lever D and hold it against the tension of the retractile spring, spring G, and bent rod ll, attached to the sliding rack, whereby the sliding motion of the rack is limited in one direction by disengaging the clutch-coimection of the trai'iswrsc shaft, substantially as described.

5. The combination, with the radially-moving die-blocks O G, wedge sliaped actuatingblocks bars (1", carrying cam-rolls (l and sleeve ll, having a cam-slot B, of the pockets N, as and for the purpose set forth.

[3. The combination,with the radially-movin die-blocks and connected operating mechanism, substantially as described, of the detachable screw-cutting plates 0, attached to and inserted in the sides of said die-blocks, and attachingscrews], substantially as described.

7. The combination of a hollow re\ *olving spindle, a sliding spindle held concentrically in said hollow spindle and receiving rotary motion therefrom, and a hollow core held concentrically in said sliding spindle and so attached to said outer hollow revolving spindle as to be held from longitudinal movement, substantially as dtseribed.

S. The combination of hollow spindle l sliding spindle ll, hollow core I, collar 1 attached to the spindle B, and connecting-tube I, as and for the purpose set forth.

El. The combination of screw-cutting dies inclosed' within a sleeve having wingshaped projections, sleeve l3, having a camslot 13" and provided with ratchet-s1raped teeth ll, said cam-slot at'stuating said sleeve (1 to open. and close the cutting-dies, substantially as described, spindle F, levers F and F, spring F and latch F, all arranged and operating as and for the purpose set forth.

10. The combination, with the die-holding mechanism having a longitudinal sliding movement, whereby the cutting-dies are fed to the work, and with mechanism for opening and closing said cutting-dies, substantially as described, of a spring by which said opening and closing mechanism is set in operation, a spring-latch for retaining the opening and closing mechanism, and a stop attached to the frame-work of the machine in the path of said retaining-latch, whereby said o1')ening and closing mechanism is set in operation to open the dies, substantially as described.

11. The combination, with mechanism for rotating the screw-cutting dies and for imparting a longitudinal feeding motion to said dies, substantially as described, of the plate K, adjustably attached to the stand A, rotatable turret mounted on said plate and carrying the three sets of bolt-gripping jaws K", K, and M M, and a sliding center L, substantially as described.

12. The combination, with mechanism for rotating the screw-cutting dies and for imparting a longitudinal feeding motion to said dies, substantially as described, of a rotatable turret carrying a center and devices for dogging the bolt and preventing its rotation, substantially as described.

13. The combination, with mechanism for rotating the screw-cutting dies and for imparting a longitudinal feeding motion to said dies, substantially as described, of a rotatable turret, a pair of jaws for grippin the bolt, and a center which is adjustable with refer ence to said cutting-dies, substantially as described.

14. The combination of plate K, rotatable turret K jaws K" K, spindles having right and left hand screw-threads K K, and gears K and intermediate actuating-pinions K, substantially as described.

15. The combination, with screw-cutting dies and with the mechanism for rotating the same and imparting a longitudinal feeding motion to said dies, substantially as described, of the plate K, capable of being adjustably attached to the su1')porting-stand A, rotatable turret K jaws K" K, spindles having right and left hand screw-threads K K, gears K intermediate actuating pinions K, and a spring-actuated bolt K", by which said turret is held from rotation, substantially as described.

AURIN \VOtH'). a

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